I have a similar problem and no matter what I try the bullets will not go away. I’m running a child theme and all the other changes appear to work apart from the bullets on the left.
https://www.highamhall.com/index.php
This is the child css which doesnt seem to get called or its overwritten. Its in the same child file as other css changes so the file is being called ok.
I’m nearly bald with the frustration, hope someone can see where I’m going wrong!!
.widget ul li{
font-size: 13px;
background: none;
list-style-image: none;
list-style-position: outside;
list-style-type: none;
}